Better error message: KeyError: "'__name__' not in globals"

[ge0ffrey]

This constraint on employee scheduling

def minimize_overtime(constraint_factory: ConstraintFactory):
    return (constraint_factory.for_each(Shift)
            .group_by(lambda shift: shift.employee, lambda shift: shift.start.date() - timedelta(days=shift.start.date().weekday()),
                      lambda shift: ConstraintCollectors.sum(get_shift_duration_in_minutes(shift)))
            .filter(lambda employee, week_start_date, duration: duration > 40 * 60)
            .penalize(HardSoftScore.ONE_SOFT,
                    lambda employee, week_start_date, duration: duration - 40 * 60)
            .as_constraint("Minimize overtime")
            )

doesn't give a good error message

INFO:timefold.solver:Solving started: time spent (33), best score (-2850init/0hard/0soft), environment mode (REPRODUCIBLE), move thread count (NONE), random (JDK with seed 0).
INFO:timefold.solver:Problem scale: entity count (2850), variable count (2850), approximate value count (500), approximate problem scale (1.160145 × 10^7692).
Traceback (most recent call last):
...
  File "python/src/employee_scheduling/main.py", line 18, in timefold
    solution = timefold_solve(problem, time_spent_seconds)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "python/src/employee_scheduling/timefold/solve.py", line 25, in solve
    solution = solver.solve(problem)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/python/.venv/lib/python3.12/site-packages/timefold/solver/_solver.py", line 109, in solve
    java_solution = self._delegate.solve(java_problem)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "python/.venv/lib/python3.12/site-packages/_jpyinterpreter/jvm_setup.py", line 256, in apply
    __import__(module_name, python_globals, python_locals, python_from_list, level),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: "'__name__' not in globals"

[ge0ffrey]

The problem lies in

lambda shift: ConstraintCollectors.sum(get_shift_duration_in_minutes(shift))

that should be

ConstraintCollectors.sum(lambda shift: get_shift_duration_in_minutes(shift)))